enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Is Central Air Worth the Cost? Plus, What You Can Do Instead

   www.aol.com/central-air-worth-cost-plus...

   However, the costs of both installing and running central AC can be quite steep. We spoke with experts to find out whether central air is worth the cost, and what some alternatives might be ...

3. Seasonal energy efficiency ratio - Wikipedia

   en.wikipedia.org/wiki/Seasonal_energy_efficiency...

   An air-conditioning unit rated at 72,000 BTU/h (21 kW) (6 tons), with a SEER rating of 10, operates 1000 hours per year at an electric energy cost of $0.12 per kilowatt-hour (kW·h). What is the annual cost of the electric energy it uses?

4. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   This calculation is called a heat loss calculation and can be done with a BTU Calculator. Depending on the outcome of this calculation, the heater can be exactly matched to the house. [ 19 ] [ 20 ] [ 21 ]

5. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   Air conditioning can be achieved using a mechanical 'air conditioner' or by other methods, including passive cooling and ventilative cooling. [ 2 ] [ 3 ] Air conditioning is a member of a family of systems and techniques that provide heating, ventilation, and air conditioning (HVAC) . [ 4 ]

6. Thermal efficiency - Wikipedia

   en.wikipedia.org/wiki/Thermal_efficiency

   So, for a boiler that produces 210 kW (or 700,000 BTU/h) output for each 300 kW (or 1,000,000 BTU/h) heat-equivalent input, its thermal efficiency is 210/300 = 0.70, or 70%. This means that 30% of the energy is lost to the environment. An electric resistance heater has a thermal efficiency close to 100%. [8]

7. British thermal unit - Wikipedia

   en.wikipedia.org/wiki/British_thermal_unit

   Btu per hour (Btu/h) is sometimes used in North America and the United Kingdom - the latter for air conditioning mainly, though "Btu/h" is sometimes abbreviated to just "Btu". [18] MBH—thousands of Btu per hour—is also common. [19] 1 W is approximately 3.412142 Btu/h [20] 1,000 Btu/h is approximately 0.2931 kW; 1 hp is approximately 2,544 Btu/h